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https://github.com/xcat2/xNBA.git
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832e86246b
even when __atribute__ (( unused )) is correctly set...
113 lines
1.9 KiB
C
113 lines
1.9 KiB
C
/* Minimal polling PC keyboard driver
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* - No interrupt
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* - No LED
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* - No special keys
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*
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* still Enough For Me to type a filename.
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*
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* 2003-07 by SONE Takesh
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* 2004-04 moved by LYH From filo to Etherboot
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* yhlu@tyan.com
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*/
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#include "io.h"
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#include "console.h"
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static char key_map[][128] = {
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{
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"\0\x1b""1234567890-=\b\t"
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"qwertyuiop[]\r\0as"
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"dfghjkl;'`\0\\zxcv"
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"bnm,./\0*\0 \0\0\0\0\0\0"
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"\0\0\0\0\0\0\0""789-456+1"
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"230."
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},{
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"\0\x1b""!@#$%^&*()_+\b\t"
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"QWERTYUIOP{}\r\0AS"
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"DFGHJKL:\"~\0|ZXCV"
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"BNM<>?\0\0\0 \0\0\0\0\0\0"
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"\0\0\0\0\0\0\0""789-456+1"
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"230."
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}
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};
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static int cur_scan;
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static unsigned int shift_state;
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#define SHIFT 1
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#define CONTROL 2
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#define CAPS 4
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static int get_scancode(void)
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{
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int scan;
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if ((inb(0x64) & 1) == 0)
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return 0;
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scan = inb(0x60);
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switch (scan) {
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case 0x2a:
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case 0x36:
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shift_state |= SHIFT;
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break;
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case 0xaa:
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case 0xb6:
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shift_state &= ~SHIFT;
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break;
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case 0x1d:
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shift_state |= CONTROL;
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break;
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case 0x9d:
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shift_state &= ~CONTROL;
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break;
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case 0x3a:
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shift_state ^= CAPS;
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break;
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}
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if (scan & 0x80)
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return 0; /* ignore break code or 0xe0 etc! */
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return scan;
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}
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static int kbd_havekey(void)
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{
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if (!cur_scan)
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cur_scan = get_scancode();
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return cur_scan != 0;
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}
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static int kbd_ischar(void)
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{
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if (!kbd_havekey())
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return 0;
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if (!key_map[shift_state & SHIFT][cur_scan]) {
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cur_scan = 0;
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return 0;
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}
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return 1;
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}
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static int kbd_getc(void)
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{
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int c;
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while (!kbd_ischar())
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;
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c = key_map[shift_state & SHIFT][cur_scan];
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if (shift_state & (CONTROL | CAPS)) {
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if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) {
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if (shift_state & CONTROL)
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c &= 0x1f;
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else if (shift_state & CAPS)
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c ^= ('A' ^ 'a');
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}
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}
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cur_scan = 0;
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return c;
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}
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struct console_driver pc_kbd_console __console_driver = {
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.getchar = kbd_getc,
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};
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